"Why are the flowers so red" PPT

Description

"Why are the flowers so red" PPT

Part One Content: Text Introduction

The flowers of nature are colorful and colorful. Classmates, when you stroll in the garden and enjoy the beauty and fragrance given to you by orchids in spring, lotus in summer, chrysanthemums in autumn, and plums in winter, have you ever thought: Why are these flowers so red? Well, today, Let's study an explanatory essay that explains the color of flowers and their changing patterns - "Why Are Flowers So Red".

show target

Understand the basic characteristics of explanatory texts and understand that the text introduces scientific knowledge about why flowers appear red and other colors from different angles.

Learn how to organize fact-explanatory essays in a logical sequence and how to explain things from multiple perspectives.

Stimulate interest in exploring nature and cultivate awareness of learning, loving and using science.

Why are the flowers so red PPT, part two: information link

Jia Zuzhang (1901～1988) was born in Haining, Zhejiang. Mr. Jia Zuzhang is a famous biological science popularization writer. In his lifetime, he published 26 collections of scientific sketches and popular science books such as "Bird Research", "Birds and Literature", "Biological Sketch", "Blue Blood Heart" and "Resilience of Life", among which his "Why Are the Flowers So Red" was selected Junior high school Chinese textbook.

In the 1980s, China Association for Science and Technology and the State Publishing Administration. The Central Broadcasting Administration and the China Science Popularization Creation Association jointly held a national selection event for "Excellent Science Popularization Works of the New Long March". Jia Zuzhang, an older generation biologist and famous science popularization writer, wrote the article "Why Are the Flowers So Red?" which was published in July 1979. After it was published in Guangming Daily on March 11, it was praised by people and won the first prize of this event.

Common explanatory sequences in expository essays

The instructions must be in order, which is a necessary condition for the explanation content to be organized. Common explanation orders include: chronological order, spatial order, and logical order. The chronological order of exposition is similar to that of narrative. In terms of spatial order, special attention should be paid to clarifying the position of space, paying attention to the inside and outside of things, size, up and down, front and back, left and right, etc. Logical sequence is often expressed as a reasoning process. What order to adopt depends mainly on the characteristics of the object described by the author. Explain the development and changes of things, and the time sequence is easy to express clearly. When writing about the structure of a building, it is difficult for readers to understand it without the spatial order. Use logical order to explain things, so as to reflect the internal relationships of things.

Why are the flowers so red PPT, the third part: preview test

1. Read the pronunciation of the characters

prism wilting nectary

secretion flowers indigo number

2. Write the glyph

zhuó（ ）hurt 花è（ ）

tuì ( ) color and dì ( )

Three. Remember the meaning of a word.

1. Romantic: the color is bright and beautiful; frank and natural, without any artificiality.

2. Abundant: Sufficient and vigorous.

3. Thousands of purples and reds: describes the blooming of a hundred flowers with bright colors. It also means that things are colorful or things are prosperous. The text describes the flowers as rich in color. Example: Our life should not only bloom in one color, but should be colorful and colorful; our life should not only taste one taste, but should have all the ups and downs.

Why are the flowers so red PPT, Part 4: First reading perception

Explain method

Introduction 1. What are the main explanation methods used in this article?

Explain the order

Introduction 2: What order of explanation does the article use? In what ways does it explain why the flowers are so red?

Description structure

Introduction 3. What structure does the text arrange the materials according to?

Hierarchy

The first part (①): Praise the red color of flowers in a lyrical style, and put forward the core of the explanation - "Why are the flowers so red?"

Part 2 (②-⑩): Explain "Why the flowers are so red" from different angles.

Part Three (11): Summarize the reasons for the red flowers and summarize the full text.

Why Are Flowers So Red PPT, Part Five: Intensive Reading Taste

1. The author often uses "Why are the flowers so red" as the first sentence of the paragraph in the text? How many times does it appear? In what form does it appear? Why is it written like this? what is the benefit?

[Answer] ① The sentence "Why are the flowers so red" appears seven times in the article. Using it as the first sentence of the paragraph can clearly indicate the center of the article's explanation. ② "Why are the flowers so red?" mostly appears in the form of a question. Except for the first paragraph, which is a general introduction, the following paragraphs are set up with separate questions, which can play a role in explaining the angle and content; writing in this way can not only arouse the reader's interest in reading, but also make the level of the article clear and in-depth step by step. .

2. What order of explanation is used in paragraphs 2-7 and 8-10? What aspects explain why the flowers are so red?

[Answer] Paragraphs 2-7 are in logical order. Explain "why the flowers are so red" from the perspectives of material basis, physical principles, physiological needs, and evolutionary perspectives. Natural paragraphs 8-10 adopt a chronological order and explain "Why the flowers are so red" from the perspectives of natural selection and artificial selection.

3. Can the words "generally", "mostly" and "gradually" in the last sentence of this paragraph be deleted? Why?

[Answer] None can be deleted. "General" and "most" are limited in scope, indicating that special flowers are excluded. After deletion, the meaning of the sentence becomes all flowers, which is not realistic and reflects the accuracy of the expository language. "Gradually" limits the change in color, indicating that the process from dark to light is gradual. After deletion, the meaning of the sentence will suddenly fade, which is inconsistent with reality and reflects the accuracy and rigor of the expository language.

Why are the flowers so red PPT, Part Six: Study and Research

1. [Method Exploration] The language of this article is accurate and strict. Can you give a few examples from the article to analyze?

[Answer] Example: If some white flowers, such as chrysanthemums, are slightly red before withering, it means that they also contain a small amount of anthocyanins at this time. A special example of color change is the color hibiscus. It is white when it first blooms in the morning, turns to light red at noon, and turns to deep red in the afternoon. It changes three times a day, becoming more and more beautiful as it blooms. In general, most flowers are bright and colorful when they first bloom, and then gradually fade.

(This paragraph explains that changes in the anthocyanin content in the cell fluid of white flowers will cause the flower color to change from white to red)

Some restrict white flowers, which means that not all white flowers will cause discoloration of flowers; special modification examples, which means that color-adding hibiscus is very rare; general modified flowers, which means exceptions for special circumstances.

2. [Difficult Research] Is the explanation object of this article the causes of the formation of various colors?

[Answer] Although this article introduces the causes of various flower colors, it focuses on the redness of flowers. The purpose of introducing the causes of other flower colors is to supplement the causes of redness from multiple angles and aspects to highlight the appearance of flowers. The reason or condition for the red color. In addition, the sentence "Why are the flowers so red" appears in many places in the article, which also highlights the key points of the article's explanation. Therefore, the explanation object of this article is the reason why the flowers are so red, rather than the reasons for the formation of various flower colors.

Why are the flowers so red PPT, part seven: summary

This explanatory essay introduces the causes of various flower colors from different angles, and scientifically explains that the color of a flower is the result of its own various conditions and needs, as well as the effects of natural, artificial and other factors on it.

1. Rigorous structure and clear organization. Looking at the full text, the author closely follows the title and arranges the materials in the manner of "questioning (general) - explanation (divided) - summary (general)". The main part is explained in a logical order and is clearly organized.

2. Use a variety of explanation methods comprehensively. This article comprehensively uses explanatory methods such as giving examples, making comparisons, listing numbers, citing data, etc., which plays an important role in the explanation process.

3. The language is accurate and strict. Some modifying and restrictive words are appropriately used in the article to explain the truth accurately and rigorously.

Why are flowers so popular PPT, part 8: expansion and extension

Appreciate peonies

Liu Yuxi

The peony demon in front of the court is ① unqualified ②, and the hibiscus on the pond ③ has little love ④.

Only the peony is the true national color, and it moves the capital when it blooms.

[Notes] ① Demon: Gorgeous and charming. ②Ge: quality, style. ③ Lotus: lotus. ④Qing: Interesting. ⑤National color: Originally refers to the most beautiful woman in a country, here it refers to the outstanding, gorgeous and noble peony flowers. ⑥Mobile: startled.

[Appreciation] The poet did not go straight to the point to describe the color and shape of the peonies. Instead, he placed the peonies in a hundred gardens. Compared with the best flowers such as "Peony in front of the garden" and "Hibiscus on the pond", he thought that the peony in front of the garden was It is too gorgeous and not high in style. The lotus in the pond is too clean and lacks interest. After evaluating peonies and hibiscus, the author expressed his opinion: among hundreds of gardens, only peonies are the most beautiful. During the blooming season, countless people come to admire them, and even alarm the entire capital. The whole poem is cleverly conceived and expressed concisely and to the point.

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"Why are the flowers so red" PPT courseware 11:

"Why Are the Flowers So Red" PPT Courseware 11 Independent Communication Overall Perception Read the text in the way you like and try to solve the following problems. 1. Pronounce the following dotted words: burn ( ) injury naked ( ) seed nectary ( ) secretion ( ) calyx ( ) flower (..

"Why are the flowers so red" PPT courseware 10:

"Why Are the Flowers So Red" PPT courseware 10 About the author Jia Zuzhang (19011988) is a famous biological science writer. A native of Haining, Zhejiang. His works are conveyed vividly and vividly in colorful literary ways. Scientific knowledge, mainly biology, realizes literature and...

"Why are the flowers so red" PPT courseware 9:

"Why are the flowers so red" PPT courseware 9 Explanatory text Classification of things Description: introduce the shape, structure, characteristics, function of things Principle description: explain the meaning, principle, relationship, evolution of things Explanation method: define, classify, give examples, make Compare, compare...

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Update Time: 2024-10-17

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